XML 186 R131.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Derivative Instruments - Gains (Losses) of Derivative Instruments (Details) - Derivatives not designated as hedging instruments: - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |
Gains (losses) on derivative financial instruments | $ 1,847 | $ (152) | $ 4,566
Included in interest income on loans | Interest rate contracts |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |
Gains (losses) on derivative financial instruments | 4,137 | 3,981 | 2,402
Included in mortgage banking income | Interest rate lock commitments |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |
Gains (losses) on derivative financial instruments | 779 | 356 | (2,111)
Included in mortgage banking income | Forward commitments |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |
Gains (losses) on derivative financial instruments | $ (3,069) | $ (4,489) | $ 4,275

X
- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
Name: | us-gaap_DerivativeGainLossOnDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DerivativeGainLossOnDerivativeNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_InterestIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=rnst_GainsOnSalesOfMortgageLoansHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateLockCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |